From a bash shell, store new-line separated strings into a variable, and execute a command for each line.

Execute_command_foreach_line.sh

#!/bin/sh
#
# From a bash shell, store new-line separated strings into a variable, and
# execute a command for each line. 
#
# Author: Caleb P. Burns
# License: CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
# Version: 1.0.0

# Enter new-line separated strings into $LINES.
read -rd '' LINES <<'EOF'
line 1
line 2
line 3
line 4
EOF

# Iterate over each line in $LINES, and do something with it.
# - NOTE: Do not double-quote $LINES; otherwise, it will be treated as one
#   single line.
# - NOTE: Depending on the style of each line, you may want to double-quote
#   $LINE. If $LINE is a single value with spaces, then you want to double
#   quote it.
for LINE in $LINES; do echo "$LINE"; done